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Full text of "Design for power plant"

Iliiaois Institute 

of Technology 

UNIVERSITY LIBRARIES 



AT 18 5 

Henwood, P. E. 

Design for power plant 



For Use In library Only 



DESIGN 



FOR 



POWER PLANT 

A THESIS 



PRESENTED BY 



PROCTOR E. HENWOOD 

TO THE 

PRESIDENT AND FACULTY 

OF 

ARMOUR INSTITUTE OF TECHNOLOGY 

FOR THE DEGREE OF 

BACHELOR OF SCIENCE IN MECHANICAL ENGINEERING 

HAVING COMPLETED THE PRESCRIBED COURSE OF STUDY IN 

MECHANICAL ENGINEERING 

MAY 20, 1910. ^ 

ILLINOIS INSTITUTE OF TECHNOLOGY -^^^^jt^T^^ 

PAUL V.GALVIN LIBRARY -^^^^ ^ /i S^ 

35 WEST 33RD STREET -^^/^^^'^■■-^■^^^'^^ 

CHICAGO. IL 60616 x^t^-'^.^dl^^^u^ 



SCOPE 05" THIS THESIS. 

A corporation in the City of Chicago has at present two 
buildings located within the loop district. One of these buildings 
is devoted to office use; the other to light manufacturing and 
jobbing concerns. It is proposed that a new building will be erected 
to be devoted to manufacturing purposes, its location being on the 
Chicago River. See Map. The power for lighting and operating the 
elevators in the two buildings mentioned is purchased from a central 
station. A low pressure steam heating system furnishes heat for 
both buildings. 

The economical questions are: First, will it pay to operate 
the three buildings as one unit, i.e., with a plant located in the 
new building; Second, what will be the cost of such a plant; 
Third, the probable revenue to be derived; and Fourth, the cost of 
operation. 

Operation of three buildings as on e unit. 

Under the present method of operation the following help 
is employed: A Chief Engineer, one Assistant Engineer and two 
ftemen; this is for the winter months. Through the summer months 
when the heating system is not in use the firemen can be dispensed 
wjt h, as the Assistant Engineer can tend the hot water fire during 
the day and the night watchman at night. With one large plant the 
above help increased by one assistant engineer, one fireman and ori'^ 
oiler, is ample for operation h1 h11 lJin«;;. Also ov'sv^ to the fact 
that all labor and fuel are at one point, operation will be cheaper 
than with two smaller plants. As? the j:lfint v/oi;lo I'e v^iir tlie river 
: ■ r-av I'e '- V >: :• .'1 ■^. ec! ccndensing with high economy through the summar 
months. The tunnel of the Illinois Tunnel Company to the other 
bui).ding affords an easy means for transmission of steam and electric 
current. 

Description of^ Pl ant . 

The plant consists of water tube boilers fed by chain grate 
stokers, overhead coal bunkers, and coal and ash handling machinery. 
High speed compound engines running condensing direct connected to 
djr ect current generators. Coal will be delivered through the tunnel 
or by wagons direct to storage bin without extra handling. 

Esti mated Cos t_ of Plant , 

The plant is estimated to cost $60,000. of which amount 
|46,000, is required for the electric plant and $4,000. for heating, 

22188 



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Estimated Annual Gross Revenue. 



It is expected that all light and noti-ve power required "by 
the tenants will be furnished by this plant. The estimated amount 
of current from which a revenue can be derived is 420,000 kilowatt 
hours. Computing this at a metered rate of lo/ per kilowatt hour, 
with a rebate of l/ per kilowatt hour for prompt payment, i.e., 9j^ 
gives $37,800. This price of 9j^ per kilowatt is the rate at which 
the Commonwealth Edison Co. furnishes current for individual lighting. 



Estimate d Cos t to Operate Plarit . 

Interest 4.5^, Depreciation 5^ insurance 
and taxes 2% - ll-l/2^ on $60,000. |6,900.00 

Fuel - 

845,000 KV hra. ® 8# - - - 3380 tons 
Standby losses 1-1/2 tons per day 548 

3yiJ8 " 
3928 tons '^ $1.50 + ,50 = - - - - - 7,856.00 

Labor - 

1 Chief Engineer |150.00 per mo, 

2 Asst. Engineers ® $85,00 170.00 
1 Oiler 70.00 

3 Firemen @ $75.00 225.00 
1 Helper for Bldgs. "A" & "B" 75.00 

690.00 per month 
Labor for 12 months --------- 8,280.00 

Hauling ashes ------------ 300.00 

Machinery Repairs ---------- 350.00 

Supplies, packing, oil and waste ----- 400.00 

Tunnel Rental -- -.-- 2,000.00 

26,086.00 

Revenu e. 

The estimated revenue will be as follows: 
Esti mated Qro ss Reven ue: (See page aa ) 

?lS)~^?50Ti:r Rrirrergy^per KW hr. 37,800.00 

Estimated Net Revenue --------- 11,714.00 

Investment in plant other than that required 
for heating = $60,000. - $14,000. = $46,000. 

Return on investment of $46,000. = 25^ 



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DETAILED EXHIBIT. 
. - - - 



The following pages contain a more detailed Exhibit, 



Respectfully submitted , 



l^ 



/X< ^-^- (^. ^L^^i^^ . 



. f I a: I H X s a a I I A T 3" cr 

- - - - 



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Design of a Power Plant. 

With the location given the design of a power plant can "be 
divided into two general parts: first the requirements, and second 
the design of the apparatus to meet the requirements. 

The requirements of a power plant are,- that it shall furnish 
at all times a stated amount of power in some form as light, heat 
or refrigeration, or that it can furnish power direct as electric 
current for conversion, for either individual or conmiercial use. 

The design of a power plant in general depends upon the form 
of energy desired. Individually the design is broad and variable, 
being influenced by many factors, such as accessibility to fxiels, 
kinds of fuel and their costs, availability of water supply and its 
purity. The most important factor is the load, for upon this the 
efficiency of the plant is based. When the load is constant and 
at full rating the highest efficiency can be obtained, but with a 
variable load and at low rating the efficiency falls off and operation 
becomes costly. 

The plant under consideration has been designed to meet the 
requirements of typical office and light manufacturing buildings, 
and will furnish light, heat and power. owing to the location of 
this plant it is expected that power can be sold, and to thi end 
reserve power has been installed. 

The plant will operate condensing during the summer months, 
while in the winter the exhaust steam will be used for heating the 
buildings. All power necessary for operating elevators and such 
appliances as the buildings may contain will be furnished by this 
plant. Also itis in ended to furnish the lighting and motor power 
to the tenants of the buildings. 

The power generator s willbe four High Speed Engines direct, 
connected to direct current generators, as follows: 

Unit # 1 

75 H.P. Simple with 50 K W Generator 
Unit #2 

150 H.P. Compound with 100 K W Generator 
Units #3 and #4 

225 H. P. Compound with 150 K W Generator 

A condenser of the surface type will be used in conjunction 
with Unit #2, #3 or #4. 

Pour boilers will be installed in batteries of two boilers 
each, they will be water tube type, fed by chain grates, each boiler 
being 250 H.P. to contain 2500 sq. ft. of heating surface and operate 
a steam pressure of 160# per square inch. The grates will have an 



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area of 63 sq. ft., being 9 feet long by 7 feet wide. 

The furnace has been designed for a low grade Illinois coal 
"Springfield District" and with the lar^e tile roof will insure 
smokeless combustion. In the floor of the combustion chamber is 
a small opening that connects with the ash hopper and affords an 
easy method of removing the light ashes. Sufficient room has been 
allowed in front of the boilers for removal of tubes and stoking 
grates in case of repairs. Each battery of boilers enclosed a 
building column, but at a distance sufficient to allow for an air 
space around the column. The piping has been arranged with the 
view of being easy of access, runways being provided over the boilers 
and along the staam header. 

Provision has been made for the delivery of coal by wagons or 
through the Illinois Tunnel, the floor of the boiler room being at 
the tunnel grade. 

Coal received by the tunnel may be delivered in front of the 
boilers for hand firing, or dumped into a hopper from which a bucket 
conveyer will carry it either to overhead bunteers or to the storage 
bin. Coal received by wagons will be dumped directly into the 
storaige bin, from where it will be fed into the bucket conveyer, 
thence to bunkers, or by hand carts to the front of the boilers. 
The ashes will be elevated to the ash bin from which it may be drawn 
off into the tunnel cars or into a push cart, and taken by an elevator 
to the surface. 

Water from the heating systems in Buildings "A" and "B* will 
be returned to the plant by roans of a centrifugal pump direct, 
connected to a D. C. motor. The pump will be located at about 
tunnel grade in Building "A* with its suction attached to a tank 
conveniently located. 

Two duplex boilers feed pumps of the ram pattern are to be 
installed, the dimensions being 7-l/2" x S" x 6". 

An open type of feed water heater will be used, the exhaust 
steam from the boiler feed pximps, the condenser puunp and the stoker 
engines being used for heating. 



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jMUMMMi 




SvoH-chboord. 



POWER PLANT 

FOR 

BUILDING'C' 

Sccic «' I F«o-t PE.H. 



^o 




iTmrxxujLBBiyiiv 



ifiSi 









1 IDES/GN 

1 1 OF 

POWER PLANT 

FOR 

BUILDING 'C 

Sccle %'IFoa-f-. PE..H. 



FLOORPLAN OF BUILDING X 



Figure 4.. 




FLOOR PLAN OF BUILDING 'B' 



Fi^ur&S. 



-240 



FIR2T FLOOR PLAN 







Loadiiiq Platform. 




Madison SfTtef 



PROPOSED BUJLO/NG 

MARKET STREET 
3ca/e /'=30' aec,24,l909. 



GENERAL DATA 



1 2 





Bldg. "A" 


Bldg. • 


B" 


Bldg. "C" 


Ploor Space 
Length 










100.75' 


111. 


28' 


257 • 


Width 


44,8' 


75. 


67* 


9f • 


Area In Sq. Tt. 


4502.6 


8420. 


6 


24672 


Stories 


14 


12 




14 


Hefe h"t of - Arerage 


11» 


11. 


5' 


10* 


Glass Surface 










in Sq^ Pt. 










il'ortTi iScposure 


3349 


6321 




16435 


¥est " 


5143 


5174 




7360 


South •• 


3369 


9177 




16170 


Bast » 


4600 


3929 




7525 


Wall Exposure 










exclusive of glass 










in sq. ft. 
North Bbqp«ure 










3572.6 


8979 




20316 


West * 


10422.6 


5230 




6378 


South " 


3552.6 


6123 




20561 


East • 


10965.8 


6475 




6203 


Total Wall Exposure 










Glass Equivalent 










in Sq. Pt. 


20535 


28572 




55473 



Cubic Peet of Air 
in Building 



746662 



1372804 



4234208 



Type of Heating System Steam Vacuum Steam Vacuum Steam Vacuum 



Radiation in Sq. Pt. 5062 



7042 



13672 



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Determination of Radiating Surface for Heating, 

The overall dimensions of the huildings were taken, thus giving 
the total area in square feet of the walla. Prom the area of each 
wall was deducted the area of all the openings in the wall, the 
openings being considered as glass. These areas are all noted 
according to their exposure; as North, South, East and West walls. 
The radiating surface was determined from these areas by ne ans of 
a formula by Professor Carpenter, and is as follows: 



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rawoXXol a£ ai l»n« ,if»*neqT60 icaae^oi*! ycf «XwBfol « 



Building "A" 
Exposed Area In Glass Equiralent. 

ITorth Glass ------- 3349 sq, Pt. 

West •• ------- 6143 » » 

South •• ------- 33g9 »» m 

Bast " ------- 4600 •• " 

Sky Ligk ••------- 234 " " 

Tota ------ Ig6d5 

Horth Wall ------- 3572.6 Sq. yt. 

West ••-- 10422.8 •• " 

South •»------- 3552.6 •• " 

East -------- 1096 5.8 " " 

Total ■geBTsVSi 

Total Glass ------- 16695 Sq. Pt, 

loX N. •• 335 " ■ 

10^ W. *------- 514 It n 

10/ Total Wall Glass Equivalent 2851 • •• 

10;^ N. •• » * 36 •• " 

loX V. " » • jp4^ N m 

Total - - - - - 2053*5 



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15 



Building "B* 
Exposed Area In Glass BquiTalent. 

North glass ------- 6321 Sq. Pt. 

West " ------. 5174 N N 

South » ------- 9177 n » 

Bast " -----. - 3929 " •• 

Total 24601 

North Wall ------- 8979 Sq. Pt. 

West •• ------- 5230 •• " 

South " ------- 6123 •• » 

East •• ------- 6475 » " 

Total "SSSoT" 

Total Glass ------ -24601 Sq. Pt. 

lO;^ N. * -------632" " 

10^ W. •• -------517" •• 

10^ Total Wall glass Equiralent 2680 " •• 

10,^ N. " " " 90 * " 

109^ W. ■ " " 52 " " 

Total ""365^2"" 



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16 

Building "C" 
ExpoBed Area In aiaee Equivalent. 

North GlasB ------- 16435 Sq. Ft. 

West • ------- 7350 " " 

South " ------- 16170 •• " 

East ■ ------- 752 5 ■ » 

Total ~Trm5 

North Wall ------- 20316 Sq. ?t. 

West " ------- 6378 " " 

South " ------- 20581 •• " 

Bast " ------- 6203 " " 

Total 53478 

Total Glass ------- 47480 Sq. Pt. 

lO;^ N. ■ - - 1643 •• ■ 

lOX W. " ------- 735'' " 

10^ Total Wall glass Bquiralent - 5348 •• " 

10^ N. - it • 203 " » 

loX W. •• " " 64 " •• 

Total ------ "■5'54''?'3' 



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17 



Radiating Surface. 



Building "A" 



Prom Carpenter on "Heating and Ventilation" 
we have the following formula J 

B (t - t,) = C (T - t)R or R = ^^* " *1^ 

C(!I' - t) 



Where 



: t, = Outeide Temperature = 0* 
f^ = Room " = 70» 



T = Steam " = 212* 
B = Sq. Ft. of exposed area in glass equivalent 
R = Radiating Surface in Sq. Pt. 

G = Heat Units per Sq. Pt. per degree per hour from 
radiating svirface 

^ '^ '^ (l ii-? ^ ) ' "^ ^^^ Sq.Pt. or 1437450 BTU per hour in zero weather 

As the mean cold temperature is about 35® only l/2 this heat is 
necessary, or 716725 BTU per hour. 

Building "B" 

^ '^ ^lf212- 7 0^^ '^ ''^^^ ^^' ^*' **** 2,000,000 BTU per hour in zero weatl 

As the mean cold tenqperature is about 35" only l/2 this Ya et is 
necessary, or 1,000,000 BTU per houe. 



Building "C" 

R = |?|y|i^~ = 13672 Sq. Ft. or 3883110 BTU per hour in zero weathi 

As the mean cold temperature is about 35® only l/2 this heat is 
necessery, or 1941555 BTU per hour 



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Additional Heat Nacesaary Due To Ventiii tion. 

Allowing:- two changea of air per hour. That one BTU will heat 
55 cu. ft. one degree. That two BTU are radiated per sq. ft. of 
radiating surface per degree difference per hour. That the tempera- 
ture rise is from 35® to 70® F, 

Building "A" 

Cubic contents of building = 748682 cu, ft. 

35 X 748682 x 2 = 952868 BTU 
55 

Steam. 

"BTU supplied per hour (1437450 + 952868) = 2390318 

Available heat per pound steam ® 212® = 970 BTU 

2390318 4> 970 = 2464# steam in zero weather, or 1723# in ordinary 

weather. 

Building "B" 

Cubic c Client 3 of building = 1372804 cu. ft. 

55 X 1372804 x 2 =: 1747223 BTU 
o5 

Steam. 

BTU supplied per hour (2,000,000 -f 1747223) = 3747263 

Availble heat per pound steam® 212® = 970 BTU 

3747263 4- 970 = 3862# steam in zero weather, or 2832# in ordinary 

weather. 

Building "C" 

Cubic coitents of building = 4234208 cu. ft. 
3LA-1234208_jk_2 = 5388992 BTU 

Steam, 

BTU supplied per hour (3883110 + 5388992) = 9272102 

Available heat per pound steam® 212® = 970 BTU 

9272102 + 970 = 9559# steam in zero weatner, or 7557# in ordinary 

weather. 



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Steam Consianed in Early Morning Heatirg 
Winter Season 

In the present day office building the steam is generally in 
the heating system until nine o'clock in the evening. At this time 
the building is closed and as the doors and windows are all shut, 
the temperature of the building will fall quite slowly, and except 
in extreme cold weather will not be below 50® P. by six o'clock in 
the morning, at which time live steais is turned into the heating 
system. Assuming this to be the case it is then necessary to heat 
a volume of air equal to the cubi contents of the buildings from 
50® P. to 70® y. This heating i s to be done from six to eight 
o'clock in the morning with lire steam, and will be assumed to be 
5® in each half hour; or the rate per hour at which the steam must 
be supplied will be as follows: 

The total cubic contents = 6355694 cu. ft. 
Allow one air change per hour 

Allow that one B.T.U. will raise the temperatvre 55 cu. ft. 
one degree. 

Steam required to raise this volume from 50® to 70® is: 

2 X 6355694 20 _ .-..„ 
53 ^ yi^ = 4766# 

To raise this volume from 55® to 70® requires: 

2 X 6355694 ^ 15 _ ,=«aji 

To raise this volume from 60® to 70® requires: 
2 X 6355694 , 10 _ oxfiiJt 

To raise the volume from 65® to 70® requires: 

2 X 6355694 ^ 5 _ itQcM. 
5S " * 9^ " ^^^^ 



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2 

HOURLY STF.;»M CONSUMPTION FROK DAILY LOAD CUK\rBS. 
summer Season. 

Time Unit H.P. ^ Pull Load_ SJt®Mi jper_ H .P._Eour Steam per Hour _ 



5-7 AM 


1 


75 


60 


8 


3 


225 


53 


9 


3 


225 


93 


10 


3 


225 


106 


11 


3 


2J&> 


106 


12 


3 


225 


106 


1 Noon 


3 


225 


100 


2 FH 


3 


225 


V)0 


3 


3 


226 


100 


4 


3 


225 


100 


5 


3 


225 


106 


6 


3 


225 


127 


6:30 


2 


150 


130 


7 


2 


150 


100 


8 


2 


150 


80 


9 


2 


150 


80 


10 


1 


75 


120 


11 


1 


75 


70 


12 UN 


1 


75 


40 


1-5 AM 


1 


75 


30 



30.8 


2310 


17.2 


3880 


15.5 


3490 


15.8 


3560 


15.8 


3560 


15.8 


356 


15,7 


3530 


15.7 


3530 


^6,7 


3530 


15.7 


3530 


15.8 


3560 


16.8 


3780 


16.5 


2460 


16 


2400 


15.9 


2380 


15.9 


2360 


29.8 


2240 


30.1 


2260 


32.6 


2460 


34.8 


2610 



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HOURLY STBAM CONSIMPTlOIf FROM DAILY LOAD CURVES. 
Winter Season 

Time Unit H.P. € Tull Load Steam per H. P. Hour Steam per Hour 
_„ , ^ — „ *^_^ 25IS~"^ 

16.0 3540 

15.7 3530) 
) 5930 

16,0 2400) 

16.5 3720) 
) 6160 

16.3 2440) 

16.8 3780) 
) 6240 

16.4 2460) 

16.2 3640) 

) 6070 
16.2 2430) 

15.6 3510) 
) 5910 

16.0 2400) 

15.4 3460) 

) 5840 

15.9 2380) 

15.6 3510) 

) 5910 
16.0 2400) 



S-'^AM 




"T" 


75 


60 


8 




3 


225 


73.5 


9 




3 

2 


225 
]S0 


100 
100 


10 




3 
2 


225 
150 


120 
120 


11 




3 
2 


225 
150 


127 
127 


12 Ho( 


on| 


:3 


225 


116 




1 
1 


[2 


150 


116 


1 PH (t 
( 
( 


3 
2 


225 
150 


96 
96 


2 


( 
( 
( 


3 
2 


225 
150 


92 
92 


3 


! 

( 


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2 


225 
150 


98 
98 


4 


( 

\ 


3 


225 


no 




2 


150 


110 


5 


( 
( 
( 


3 
2 


225 
150 


127 

127 


5:30 


( 
( 

( 


3 
2 


225 

150 


136 
136 


6 


( 
( 
( 


3 
2 


225 
150 


88 
88 


6:30 




2 


150 


130 



16.0 3600) 

16.1 2420) 



15.5 3490) 

15.9 2390) 

16.5 2460 

6:30 PM to 5:00 AM - - ConditionB as for Sunaier load. 



6020 



15.8 3780) 

) 6240 
16.4 2460) 

17.0 3830) 

) 6320 
16.6 2490) 



5970 



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BBBB bBmBBB 




2M 

Size of Pipe to Carry Steam to Buildings "A* and "B". 

From Kent we JaTe the following formula: 

Q = 60 X .7854 x 50 D^ (144 (pi - Pg) Dj^'^ 

Where: p^^ = initial pressure of steEim 
Pg = final " of steam 
W^ = weight per cu. ft. of steam at p- 
D = diameter of pipe in feet 
L = length of pipe in feet 
Q = quantity of steam flowing per minute in cu, ft. 

Weight of steam necessary 6326# per hour = 2775 cu, ft, per minute. 

2775 = 2356 D^/^ (144 (25 15 ) ) l/2 
(TOBlTTin^) 

D^/2 =2775 o_ D^ = 2 
10555 .2629 

D = .5860 ft. = 7'» 
Computation based on needs of the most severe weather. 









-it.'i:(;Je»w e"".6%f9a raom »rf;t lo tliaen no bBs&d noltsiucpaoO 



D a i/y L oadCuri/es- 
L'i^htFui/Li}ne BrifMf Doi^ in Winter. 
Li<jht D off ecf Line DorA Dauin Winter 
Curi/es •ShoLuTotol Loads. 



25 

Size Of Electrical Units. 

In this determination two load curves, one for a bright day 
and one for a dark, foggy day, both in winter time, were obtained 
from an ofC. ce building where conditions were similar to these to 
be considered. The ordinates of these curves were effected by the 
ratio of the rentable floor area of the building to which the curves 
applied, to the rentable floor area of the building under consideration 
This gives two loads; they are for the lighting only, and to each was 
added the power necessary to operate the elevators. The two curves 
thus constructed are assumed to be maximum daily conditions for simraier 
and winter months. 

?rom these curves of maximum conditions the electrical units 
were determined and arranged to carry the load the most economically. 

Unit #1----- 50 KW 
" #2 100 K W 

•♦ #3 - - - - - 150 K W 
"#4-----150KW 

Size of Steam Units. ,,^ 

Allow an efficiency of 95^ in the electrical units and an 
efficiency of 90^ for the steam units. 

1 K W = 1000 Watts 
1 H P = 746 " 

Therefore 1000 = i,M Electrical horsepower 
746 

1.34 + 5^ = 1.407 Brake horsepowsr 
1.407 + 10^ = 1.55 Indicated horsepower 

Or roughly add 50% to the rated capacly of the electric unit 
expressed in kilowatts for the indicated horsepower of the steam unit. 



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26 

Econoioy of The Steam Units, 

These curves of engine economy are deductions from similar 

curves taken from "The Bconoray Factors in Steam Power Plants* by 
Geo. W. Hawkins. 

Hourly Steam Consumption, 

The curves of hourly steeun consumption were plotted from the 
load curves and engine economy curves, i.e., for each hour of day 
from the load curve was taken the per cent, of full load at which the 
units were operating. With this percentage from the economy curve 
is found the water rate of the particular steam unit. These values 
multiplied "by the horsepower of the unit gives the steam consumption 
per hour. 



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,-nrori leq 



J2y 

Bstimate of tlie Electrical Current Consumed 
In Buildings "A", "B" & "C". 

Lighting for Tenants - 

This estimate is computed on the basis of the rented floor area. 
The data was obtained on a typical office building; one which fur- 
nished its tenants with electrical current for lighting. 

The actual current consumed by the tentants divided by the 
total area of rentable floor space gives the current necessary for 
lighting per sq. foot. 

Lighting for Halls - 

The total area of floor space less the rented area is considered 
as halls; and as above the current used for lighting this area divided 
by the area gives the current necessary for lighting per sq. foot of 
halls. 



Current for Elevators - 

The cvirrant consumed in Buildings "A" and "B" is known, the 
meter readings having been obtained from the engineer in charge. 
The current for Building "C was estimated from that consumed in 
Building "A", the method used being that for estimating the lighting. 



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'> s 



Estimate Of Electric Current Consumed Per Year. 

For Tenart s 
Building Light & Power Hous e 



47275 sq.ft. @ 733 Watts sq.ft. 34653 KW Hrs. 

15764 * •• ••1520 " n n 



23961 KW Hrs. 



88926 sq.ft.® 7 33 Watts sq.ft. 65183 KW Hrs. 
12126 •••••••• 1520 •• •» i» 



18432 KW Hrs. 



259056 sq.ft.© 733 Watts sq.ft. 189888 KW Hrs 

86352 " •• " 1520 * " " 
Por Motor lead: 

259056 sq. ft.© 500 Watts " " 129525 
"A" 

Current to Elevators actual 
House aid Bi% e pump " 



131255 KW Hrs. 



58032 
3649 



Current to Elevators actual 
House and Bilge pumps " 



35287 
1727 



■C 



Current to Elevators Estimate 

259056 sq. ft. © 396 Watts per sq. ft. 

House and Bilge pumps 

259056 sq. ft. © 19.4 Wattsppr sq. ft. 



419249 



Total to be generated 



102586 

50257 
425386 

844635 KW Hrs. 



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&*sei# 



ba^^'Aienes o<f oct Xa^oT 



Data On Blevatore. 



No. in Start- Stop- 
Oper- ing ping 
Bldg. ation Time Time 



Hours Time for Trips SiiE 1® Current Current 
per Single per Tripe consump-conBunp 
Day Trip Day per ticn tion 

year per year per 

trip 



"A" 1 

2 
Sunday 1 
only 



7:00AM 
7:45AM 
9:00AM 



lOFM 
6 PM 
1 PM 



15 

20.5 
4 



50'' 
SO* 
50" 



1080) 466800) 



Watts 



1476) 
286 



18720) 



) 58032 KW 119,5 



■B" 


1 


7: 00AM 


10PM 


15 


35 




1 


7:45AM 


6PM 


10.25 


35 


Sunde^y 


1 


7:00AM 


1PM 


6 


35 


only 













ioti! 777900} 

603 39193 ) 35267 KW 
81709b 



43.2 



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vino 



Estimate of Cost of Power Plant Equipment, 



:^ii 



4 - 250 H.P, water t»be boilers, sectional header, in place 
4 - chain grate stokers each 7 ft. x 9 ft. = 63 sq. ft. 

wit]- two engines, shafting, pulleys, etc., in place- - 
Boiler foundations -------------- 

Boiler settings --------------- 

Coal and ash conveyer and bunkers in place ------ 

Conveyer 272 ft. © $20.00 - - $5440.00 
Driver ------- - 400.00 

4 green coal pans and valves - 176,00 
4 coal bunkers ------ 200 0.00 

Chimney, steel lined 72» x 200 ft. --^*----- 

Breeching ---------------- 

Heater ----------------- 

2 feed pumps - ram pattern ---------- 



11000.00 

3780.00 
1000.00 
3000.00 



7976.00 

4200.00 

800.00 

600.00 

750.00 



Engines and generators, horizontal high speed direct connected 
to 220 volt d. c. Generators: 



1 - 7 5 H.P simple Engine - - -:;.^30.00 

1 - 50 K ¥ generator - - - - 1000.00 

1 - 150 H.P. compound engine - 2100.00 

1 - 100 K W generator - - - - 1500.00 

2 - 225 H.P. Compound engines - 5500.00 
2 - 150 K W generator - - - - 5000.00 

1 surface condenser with vacuum pump and circulating purap 
Piping, steam, exhaust and water, in place - - - - - 



Miscellaneous and engineering 10^ 



Cost per K W I 133.00 

Coat per boiler H.P, 60.00 



Or say 



16230.00 

1200.00 
4000.00 

5454,00 

I 59990.00 
60000.00 



KW, is not unreasonable as about 



Note: The above estimated cost p^ 

one-half of the boiler plant investment (or about |14,000,) is re- 
quired for heating, making the cost of the electric plant |46,000. 
or $102.00 per KW. 



i 



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MADISON 3 TREE T 





OCCUPATIONOF CITY STREETS 

by 

•SEWERS 






Fi'^urei^. 



MADISON STREET 





OCCUPATION OF CITY STREETS 
by 

TUNNELSVSTEM 



Figure. 1 5.